Patrice Evra admits he is a 'little bit worried' that the injuries which are mounting up could derail Manchester United's bid to retain the Premier League title.
United's defence has been beset by problems in recent weeks, with captain Nemanja Vidic ruled out for the rest of the season due to a knee injury.
Rio Ferdinand, Chris Smalling and Phil Jones, meanwhile, all missed the Boxing Day victory over Wigan Athletic, while Jonny Evans was forced off at half-time in the 5-0 win and is likely to be out for two weeks.
That left stand-in captain Evra partnering midfielder Michael Carrick in the centre of defence and the Frenchman is concerned about the impact of the injuries.
"I am a little bit worried because we need everyone if we are going to win the league," said Evra. "It is starting to get annoying.
"It is not the first year we got so many injuries. Two years ago I played with Michael Carrick and Darren Fletcher at the back.
"The most important thing is that we won but I hope everyone gets fit because Blackburn is another big game and we need all the defenders."
Ecuador winger Antonio Valencia started at right-back against his former club Wigan and Evra believes the squad's versatility is a testament to the spirit at Old Trafford.
He added to MUTV: "This is the United spirit: you can play everywhere.
"If you want to win, you have to accept it. You can see Antonio Valencia playing right-back as well. Only because United play like a team.
"The team is the star, not only one player, that's why you can put me and Michael Carrick at centre-back; we're going to win because it's the team effort and team spirit. That's why I'm confident.
"I've said that from the beginning - in six years playing here - the Man Utd spirit... no one team has got that spirit. This is United. This is why I'm so proud to play here."